Fields values are missing when importing volume

[alexandrovas]

I imported resource huaweicloud_evs_volume, but some fields were not imported. Therefore terraform wants to recreate these resources.
Imported resource:

{
          "index_key": 0,
          "schema_version": 0,
          "attributes": {
            "attachment": [
              {
                "device": "/dev/vdb",
                "id": "56ddb3be-baa9-4719-8d56-d6e48fdacd0e",
                "instance_id": "61446aa2-512b-441b-b9c5-e53289bf9c67"
              }
            ],
            "availability_zone": "ru-moscow-1a",
            "backup_id": null,
            "cascade": null,
            "description": "",
            "device_type": null,
            "id": "56ddb3be-baa9-4719-8d56-d6e48fdacd0e",
            "image_id": null,
            "kms_id": null,
            "multiattach": null,
            "name": "sp2-zkp--0001-volume-0001",
            "region": null,
            "size": 36,
            "snapshot_id": "",
            "tags": {},
            "timeouts": {
              "create": null,
              "delete": null,
              "update": null
            },
            "volume_type": "SSD",
            "wwn": ""
          },
          "private": "eyJlMmJmYjczMC1lY2FhLTExZTYtOGY4OC0zNDM2M2JjN2M0YzAiOnsiY3JlYXRlIjo2MDAwMDAwMDAwMDAsImRlbGV0ZSI6MTgwMDAwMDAwMDAwLCJ1cGRhdGUiOjE4MDAwMDAwMDAwMH0sInNjaGVtYV92ZXJzaW9uIjoiMCJ9"
        }

Terraform created resources:

...
"cascade": false,
"device_type": "VBD",
"multiattach": false,
...

Expected:
Fields should be imported to terraform state.

[ShiChangkuo]

@alexandrovas the missing parameters except cascade are added by #919,
As the cascade is only used for destroying, we can not get the value from API response. It is generally recommended running terraform plan after importing an disk or ignore the changes.